Hi, I find this idea to be interesting in it's principle but to be conflicting in a couple of ways.
First of all, children may not have political agendas or as much negative bias as older people, but they do have a bias because of lack of knowledge. For example, as a kid I was very worried about animals going extinct because I had watched documentaries about this topic, but I knew nothing about the political problems going on in the Middle East, about global warming or about the shortage of plastics. For kids, a lot of things are boring and they don't get involved in knowing more about them. And some other things are very important to them but not really relevant in the overall picture.
That is because children unconsciously have a very selfish point of view of what is important or not. Things that affect them directly, or that relate with the things they like, are way more important than those things that affect others. That is common human nature, but with age and experience some of us learn that other people's problems, even if they are very far away and we will never meet them, are also very relevant and should be taken care of.
Similarly, while children don't have political agendas, children learn about the world from the people they grow around (especially their parents) and the people they look up to (influencers in the recent years), and are easily influenced by the political and general views of these people. For this reason, it is difficult to isolate what the kid thinks is important or how a kid thinks a problem should be solved, from the input and information they get and which sources they get it from.
For these reasons, I believe that we should first focus on getting children more involved in understanding the big problems of the world from a very objective and apolitical point of view. And I believe that kids should be told and asked about these topics when they reach a certain age. Adolescence is taken by a lot of people as a bad, dark period when we are all weird and stupid, but it has been proven that adolescence is the most important time for establishing one's personality, interests and concerns. I believe getting teenagers involved in the important issues of humanity is the right way to raise a more involved young generation. Actually teenagers now are way more involved in causes like LGTBQ respect, global warming and veganism than any other generation before them, thanks to the exposure these topics get on the internet and other media.
I believe that we should give a voice to these teenagers (Greta Thurnberg started as and should have been an example of that) but we have to find better ways for that.